Add an async implementation of Queue#324
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datdenkikniet wants to merge 2 commits intorust-embedded:mainfrom
Open
Add an async implementation of Queue#324datdenkikniet wants to merge 2 commits intorust-embedded:mainfrom
Queue#324datdenkikniet wants to merge 2 commits intorust-embedded:mainfrom
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Dirbaio
reviewed
Dec 23, 2022
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| me.value_to_enqueue = Some(failed_enqueue_value); | ||
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| if !me.producer.register_waker(cx.waker().clone()) { |
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This should replace the previous waker instead of spinning the CPU at 100%.
Also, cloning wakers is moderately expensive in many executors (it does atomic refcount ops. Not in embassy or RTIC though), so it's nice to avoid cloning if possible. The way you do it is:
- If no waker registered, clone and register it.
- If a waker is registered:
- If
old_waker.will_wake(new_waker)do nothing. This saves a clone. - Otherwise, drop the old one, clone the new one and register it.
- If
Contributor
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Hi, I think |
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This PR adds an async version/wrapper around
spsc::Queuewith fallible interfaces that can be used in sync contexts.Currently it uses a (non-public) single slot queue to store wakers.
We've been running this version of
heaplessfor 2 months now and it's worked well so far.